sms validation for false number

src/main/java/hs/fulda/de/ci/exam/project/SmsNotification.java

@@ -1,8 +1,11 @@
 package hs.fulda.de.ci.exam.project;
 
+import java.util.regex.Pattern;
+
 public class SmsNotification extends Notification {
     String to;
     String content;
+
     public SmsNotification(String to, String content) {
         super();
         this.to = to;
@@ -20,6 +23,15 @@ public class SmsNotification extends Notification {
     }
 
     private boolean isValidEmail(String to) {
-        return true;
+        String regexPattern = "(\\(?([\\d \\-\\)\\–\\+\\/\\(]+){6,}\\)?([ .\\-–\\/]?)([\\d]+))";
+        return patternMatches(to, regexPattern);
     }
+
+    public static boolean patternMatches(String emailAddress, String regexPattern) {
+        return Pattern.compile(regexPattern)
+                .matcher(emailAddress)
+                .matches();
+    }
+
+
 }

src/test/java/hs/fulda/de/ci/exam/project/NotificationTest.java

@@ -42,4 +42,11 @@ public class NotificationTest {
         boolean result = sms.sendNotification();
         assertTrue(result);
     }
+
+    @Test
+    public void smsShouldNotBeSentWhenNumberIsInvalid() {
+        SmsNotification sms = new SmsNotification("123", "Some Wrong Number");
+        boolean result = sms.sendNotification();
+        assertFalse(result);
+    }
 }